I don't think gyarus take having a boyfriend that seriously, more like they can't be without boyfriends if they want to keep appearances, I'm not calling her easy, is just that I don't make a big deal of her having a boyfriend or used to have one as impediment ... She's awakening to the Cute is Justice cult after all!!!
I also highly doubt that one or two having a bf or gf before could ruin this story, I'm having a great time... unless you want one of those "once in a lifetime pure true love at first sight experience only" of course.
BUT Aaaaaaaaaanyway like mycro said I guess we shouldn't worry hahaha